Improvement in saw-mslls



' UNITED STATES PATENT OFFICE.

EMANUEL ANDREWS, OF WILLIAMSPORT, PENNSYLVANIA.

IMPROVEM ENT IN SAW-M l LLS.

Specification forming part of Letters Patent No. 1011343, dated March29, 1870.

To a/ZZ whom t may concern:

Be it known that I, EMANUEL ANDEEws, of Williamsport, in the county ofLycoming and State of Pennsylvania, have invented a new and usefulImprovement in Muley-Saw Gonnections; and I do hereby declare that thefollowing is a true and accurate description thereof, reference beinghad to the accompanying drawings, and to the letters of reference markedthereon and being a part of this specification, in which- Figure lis aside elevation of the lower end of a muley-saw, showing the method ofattaching the pitman to the saine, and Fig. 2 is a front elevation ofthe same.

Like letters refer to like parts in each figure.

The nature of this invention relates to an improved method of attachingthe pitman to a muley-saw in such a manner that the line of the draftand overhang or rake in the saw may be readily and accurately adjustedto the requirements of the various kinds of timber to be sawed.

It consists, first, in riveting to the lower end of the saw awedge-shaped strap, with its upper edges in the form of a half V, withwhich engages a lipped clamp, forming part of the stub-end of thepitman; and, secondly, in the employment of a key in the slot in theclamp under the saw for securing the same in any desired position.

In operation the tendency of the clamp is to tighten up on the strap andkey, and prevent the latter from working loose.

In the drawings, A represents a section of the lower end of a muley-saw,on which is folded and riveted a metallic strap, B, whose upper edgesare inclined downward and toward the saw, forming with the latter ahalf- V groove on each side of the same. The upi per edges of this strapare tapered o toward the back of the saw, forming a wedge.

C is a clamp constructed, as shown in Fig. 2, with a longitudinal slotrunning through it, in which the lower end of the saw is inserted, theangular lips c at its upper end dropping into the grooves on the upperedges ofthe strap B.

D is a key driven into the slot below the saw, and secures the same inplace by forcing the upper edges of its strap against the lips c of theclamp, and is grooved on its upperedge to embrace the rounded edge ofthe strap.

E is a set-screw through the clamp, and serves to secure the key inplace.

b is a longitudinal depression in the side of the key in which theset-screw seats itself, and when the latter is loosened the key may bemoved back without liability to fall out of the slot.

In the operation of muley-saws it is necessary to have the downwarddraft or strain come in a certain line, more or less removed from theline formed by the points of the teeth, which varies with the kind oftimber to be sawed. In the ordinary method of connecting the pitman withthe saw, holes are drilled through the saw and stub-end, which areconnected by pins or bolts passing through them. This method ofattachment permits of no adjustment of the pitman so as to vary its lineof strain on the saw.

By the employment of the device above described the strain may bebrought on any desired point by shifting the clamp to the proper placeon the strap, where it may be secured in the manner described.

The strap being wedge-shaped, the tendency of the clamp is to tightenitself' on the strap and key by the pressure of the log against the saw.The key being grooved to embrace the rounded edge of the strap, the sawis prevented from wavering or deviating laterally from its true coursewhen'sawing through knotsor timber out of wind.

The arrangement described is equally applicable to the upper end of thesaw.for connectingit with the guide, in which case the clamp is madependent from the guide, allowing the rake of the saw to be changed fromthe top, if desired.

`What I claim as my invention, and desire to secure by Letters Patent,is

l. The strap B, in one piece, with equal inner edges tapering regularlyalike from one and the same end to the other, provided withinwardly-sloping bevels c, and with a rounded outer edge, as shown anddescribed, and for the purpose set forth.

2. The key D, grooved on its upper edge to iit closely to the outerrounded edge of the strap B, and provided with a longitudinaldepression, b, to receive the inner end of the setscrew E, as shown anddescribed, and for the purpose set forth.

EMANUEL ANDREWS.'

Witnesses: H. S. SPEAGUE,

H. F. EBERTs.

